How Often Should the Transmission Fluid Be Changed for a BMW 5 Series?

[VanElliott]

BMW 5 Series requires approximately 800 yuan for a transmission fluid change, and it is recommended to replace the transmission fluid every 80,000 kilometers. If the gear shifts smoothly and there is no significant change in transmission noise, replacement may not be necessary. Note: 1. Both manual and automatic transmissions require regular fluid changes because the transmission relies on the fluid for cooling, lubrication, and hydraulic power transfer. 2. Prolonged use of old transmission fluid will significantly degrade transmission performance, and severely contaminated fluid can lead to a series of transmission issues. 3. Only transmission fluid within its service life has fine oil molecules and maintains its anti-shear capability. The fluid forms an effective lubricating film on friction surfaces, preventing slippage, cushioning sudden impacts, ensuring smoother gear shifts, and improving overall shifting performance.